When you fight another Mordekaiser....

: Hey Morde, do you think you can get the other Morde to burn his ult? : ... I mean, yeah, but I'd have to go all out and burn mine. : ... Ya know what? I hate all of them. Do it. Get rid of both. : ... sniffle

The other : MORDE, CAN I PLEASE ULT SOMETHING I CAN KILL THIS GA- : NO!!!!!! : Veigar, shutup. : I... that's fair.

Nothing will happen.

Actually the one on the right wins in the gif.

Looks more like two Project: Yi skins fighting it out.